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HARDWARE IN THE LOOP SIMULATION OF HYBRID VEHICLE FOR OPTIMAL ENGINE OPERATION BY CVT RATIO CONTROL
H.YEO,C.H.SONG,C.S.KIM,H.S.KIM 한국자동차공학회 2004 International journal of automotive technology Vol.5 No.3
Response characteristics of the CVT system for a parallel hybrid electric vehicle (HEV) are investigated. From the experiment, CVT ratio control algorithm for the optimal engine operation is obtained. To investigate the effect of the CVT system dynamic characteristics on the HEV performance, a hardware in the loop simulation (HILS) is performed. In the HILS, hard wares of the CVT belt-pulley and hydraulic control valves are used. It is found that the engine performance by the open loop CVT ratio control shows some deviation from the OOL in spite of the RCVs open loop control ability. To improve the engine performance, a closed loop control of the CVT ratio is proposed with variable control gains depending on the shift direction and the CVT speed ratio range by considering the nonlinear characteristics of the RCV and CVT belt-pulley dynamics. The HILS results show that the engine performance is improved by the closed loop control showing the operation trajectory close to the OOL.<br/> <br/>
金永琪,申鉉造 慶北大學校 1988 論文集 Vol.46 No.-
The study was carried out to investigate the characteristics of unconsolidated-sediments in Gwangyang bay. The characteristics of unconsolidated-sediments show sedimentary environment and facies change of sedimentation, which are the strong indicators of them. The formation of Quarternary sediments of Gwangyang bay can he divided upper sand(S1). middle clay(C2) and lower alluvial layer depending on the geologic facies which, are informed from drilling investigation. Integrated analysis of engineering properties(physical and mechanical) of Quarternary sediments are correlated by IBM-PC(16b.) define its characteristics and relationship, which results are integrated as following descriptions. First, the middle clay layer(C2) is termed as normally consolidated clay. The representative value of uniaxial compressive strength(qt) is 0.81㎏/㎠. Second, the activity(Ac) of middle clay laver(C2) representated by Ac 0.75, therefor it is non-activity state. Third, if the load(pressure) of 15t/㎡ distributed on the study area the settlement can be occurs having lapse time of 20 to 240 years and amounts of 144 to 244㎝, which are differ from drainage pattern and thickness of consolidation layer. Forth, the middle clay layer(C2) has strength of anisotropy and in the unstable domain that it can be easily collapse by external strength. Fifth, the geotechnical properties are closely related to eustatic change of sea level, indicating 2 times change of it, and depositinal environment changes from fluvial environment in east part to marine environment in west part.
뇌졸중 후 발생한 괴잉성욕에 대한 Cimetidine의 치료효과 : 증례보고
유경호,마효일,정승철,이병철 대한치매학회 2002 Dementia and Neurocognitive Disorders Vol.1 No.1
Most studies have agreed that there is a considerable decline in sexual activity following stroke. but the hypersexuality after stroke as a relatively isolated behavioral abnormality has been less frequently reported Hypersexuality has no proven treatment, although reports have described reductions in hypersexual behavior did not response to three medications were not uncommonly observed in clinical practice A 65-year-old right-handed male presented with acute left hemipararesis. His MRI showed a right middle cerebral artery infarct involving the temporal, parietal regions and the basal ganglia. Four weeks after stroke he showed abnormal behavior, such as incessantly holding and hugging the nursing staff without assent, but no increased orality or change in eating habits But several weeks after taking cimetidine. a histamine H₂-receptor antagonist. his sexual behavior showed a marked improvement This case demonstrates that cimetidine as a non-hormonal anti-androgenic effect decreased libido and hypersexual behavior without serious side effects in patients with cognitive decline after stroke Further studies that obviously define the response and long-term side effects of cimetidine are needed to confirm our observations.
피질하 혈관성 치매 환자에서 협착성 뇌혈관 병변의 의의 : 자기공명 혈관조영술과 양전자방출단층촬영을 이용한 연구 MR Angiography and ^(18)FDG-PET Study
유경호,이병철,마효일,김윤중,정지향,나덕렬,강연욱 대한치매학회 2004 Dementia and Neurocognitive Disorders Vol.3 No.1
Background and Objective:Subcortical vascular dementia (SVD) incorporates small vessel disease as the primary vascular etiology, represents in MRI by lacunar infarct and deep white matter lesions. In clinical practice, a number of SVD patients present with various vascular risk factors for large artery disease (LAD) i.e., old age, hypertension, and diabetes. However the current diagnostic criteria for SVD did not include angiographic findings as a key feature. Therefore we tried to find out the frequency of large artery disease in SVD and to elucidate whether the presence of LAD affects clinico-radiological manifestations of SVD. Methods:Thirty three patients fulfilling 'Research criteria for SVD' by Erkinjuntti from 17 study centers were recruited. Of these 33 patients, 21 who underwent comprehensive neuropsychological test battery, MRI ^(18)FDG-PET, and MR angiography were classified into two subgroups according to the patterns of MRI abnormality:white matter dominant (WM) type (n=5) and multiple lacunar (LC) type (n=16). Clinical and neuropsychological profile and ^(18)FDG-PET findings of 21 SVD patients with and without LAD were compared. Results: Twelve (57%) of 21 SVD patients had mild stenotic lesions in intracranial large arteries:4 in middle cerebral artery, 8 in posterior cerebral artery, and 4 in vertebrobasilarj artery. There were no differences in vascular risk factors, characteristics of cognitive dysfunctions, and ^(18)FDG-PET findings between SVD with and without LAD. Conclusions:Our results showed that the presence of mild degree of large artery stenosis did not affect the clinical., neuropsychological profile and cerebral metabolism in PET. Therefore, the current 'Research criteria for SVaD' by Erkinjuntti could be used to diagnose SVD as a homogenous clinical group regardless of angiographic abnormalities.
이명종,김광국,이상암,마효일,윤준오 울산대학교 의과대학 1993 울산의대학술지 Vol.2 No.1
This is a report of familial carpal tunnel syndrome(CTS) occuring in four members of two generations of a Korean family. One of those with CTS had surgical release and its pathologic finding was nonspecific fibrotic change. The age of those affected by CTS ranged form 35 to 76 years of age. Family pedigree suggests an autosomal dominant gene. This is belived to be the first case report of familial carpal tunnel syndrome in Korea.